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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Generally erect (decumbent or prostrate), branched or not, branches 0–9(50). Stem: 5–30 cm, [1.8]3–7.5 cm diam, spheric to cylindric [or obconic], firm to soft, not regularly segmented; ribs 0, tubercles prominent, conic to cylindric, not grooved. Spines: 14–64(90) per areole, < 2 mm diam, needle-like [to hair-like or bristle-like], glabrous [or plumose], straight or hooked [or curved to crinkly]; central spines 1–4 [0–many] per areole, generally hooked. Flower: lateral, in axils of tubercles, 1–5 [7.5] cm diam; perianth cream to white, pink, purple, or lavender; ovary glabrous, spines 0, scales 0. Fruit: club-shaped or cylindric to ovoid [or barrel-shaped], indehiscent, generally red, spines 0. Seed: 0.8–1.5 mm, generally shiny, generally pitted or raised-netted, black [brown to ± red or ± yellow], occasionally with aril.
150 species: North America. (Latin: nipple) [Hunt 1984 Bradleya 2:65–96; Hunt 1985 Bradleya 3:53–66; Hunt 1987 Bradleya 5:17–48]
1. Radial spines in 2–3 superimposed ranks; outer perianth parts long-fringed, inner perianth parts 20–28; seed with large corky aril ..... M. tetrancistra
1' Radial spines in 1 rank; outer perianth parts entire or short-fringed, inner perianth parts 8–16; seed aril 0
2. Inner perianth parts cream to white; bristles in axils of tubercles ..... M. dioica
2' Inner perianth parts rose-pink to rose-purple; axillary bristles 0 ..... M. grahamii var. grahamii
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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